Article IV, as applicable. Notwithstanding anything herein to the contrary, Owner shall not be obligated to pay for any costs, fees or expenses associated with the amendment, supplement or modifications of the Manual or any other manuals used by Manager or the preparation of any new or replacement Manual or any other manuals used by Manager. Any Costs associated with obtaining or maintaining the FAA Approval shall be billed to Owner, in an amount equal to the Costs of such operations plus a markup of ten percent.  
4.2    Commercial Operations. The Parties acknowledge and agree that they intend for the Aircraft to be utilized by Manager for Commercial Operations at all times with the express understanding that Manager may, in its sole discretion, operate the Aircraft on appropriate ferry, maintenance, training (as limited in Section 2.6) or positioning flights under Part 91 of the FARs. Whether operating under Parts 133, 135, 137 or under Part 91, Manager will be in Operational Control of the flights.   
4.3    Operational Control During Commercial Operations.